My 2006 EFI Dyna Wide Glide won’t run. Was running on front cylinder only and throwing P1355 code. The info. I have is that this indicates “Rear Ignition Coil Driver High/Shorted”. I checked spark and got none on rear cylinder. Switched plugs and wires and still running on front cylinder only. Installed a new coil and still running on front cylinder only. Cleared code and now won’t run at all. I need help with diagnostics and repair?

 

Disconnect coil power connector
Measure voltage on terminal A of connector which is the yellow wire with a green tracer
Voltage should be equal to battery voltage during first 2 seconds after key on.
It only gets power for 2 seconds after you turn ignition on so you might need someone to turn on while you measure voltage with a multi meter.

Let us know what you find.

 

I do have battery voltage for 2 seconds on the Yellow/Green wire when I turn on the ignition. I can also hear the fuel pump come on and go off after 2 seconds.

 

Ok the 2 end wires on the coil connector Yellow/blue and Blue/orange you need to check the resistance Ω ohms from the ECM (unplug from ECM) to that connector and see that both are less than 0.5Ω

If NO then look for damage to the wires and if YES then the harness needs a wiggle test and let us know what you find.

 

Both wires showed 0 resistance. I wiggled both and saw no change in resistance. Also checked resistance to ground while wiggling and showed no short. I replaced the coil, cleared p1355 code and started. Still running on front cylinder only and p1355 code came back.

 

Ok plug the ECM back in and leave the coil disconnected turn the power on and check for ground/earth from the yellow/blue & blue/orange wire and if no then check for voltage and if no again

Then use a test light for the next inspection yellow/blue wire coil connector and white/black wire runs into ECM but ECM needs to be plugged in so you might have to undo connector which is a good time to see if any pins have backed out of cavities.

Crank motor and see if test light flashes.

Let us know.

 

I pulled the plug on ECM. Pins looked OK on ECM and plug. Plugged back in and found Ohms to ground on Blue/Orange = Open, Yellow/Blue = .449 Meg. With ignition on found no voltage on either wire. Using a test light with incandescent bulb I got no flashing light on either wire. Started and still running on front cylinder only and now throwing p1351, p1354, and p1355 codes.

 

If you got continuity to ground on the yellow/blue wire which is the rear coil wire then it is shorting to ground somewhere and needs to be fixed .449
Concentrate on that.
Don't worry about the codes just clear them.

 

1. I mislead you on the light flash test. I ran it from the wires at the coil to ground. I had the coil unplugged and the EMC plugged in. My wiring diagram shows a BK/W wire at the ECM labeled “5 Volt Sensor Ground”. Should the light flash test be run from that wire? If so, how would I connect my test light to it with it plugged into the ECM. Should I have both the coil and ECM plugged in?

2. Looks like you think the .449 meg ohm to ground is the problem. I unplugged everything and reinspected. I can’t see any problem. I don’t see any continuity to ground on the Yellow/Blue wire with the EMC unplugged in but the .449 meg Ohm to ground comes back when it’s plugged back into the ECM. Wouldn’t that mean the ground is inside the EMC?

 

It probably means your ECM is fried and has to be replaced but let's confirm
White with a black stripe not black with a white stripe
ECM needs to be plugged in and you will have to work out the best way for you to access the wire I just puncture the wire and cover later with some liquid tape
Leave coil unplugged and you will get codes ignore.